Page 32 - My FlipBook

:
::

8 THE TECHNICAL PROCEDURES IN FILLING TEETH.
—
And
An axial wall, a. w.
In the step portion
A distal (or mesial) wall, d. w.
A buccal wall, b. w.
A lingual wall, l. w.
And —

A pulpal wall, p. w.
Notice that in mesial cavities, the mesial wall of the step
portion will be missing, and in distal cavities the distal wall
of the step portion will be missing.
In a mesio- or disto-occlusal cavity in a bicuspid or molar
in which the pulp is removed, tlie pulpal and axial walls are
removed. The floor of the pulp chamber becomes the sub-pulpal
wall of the cavity. This is usually distinct from the gingival
wall, because it is on a different level. Therefore, a mesio- or
disto-occlusal cavity in a molar or bicuspid with pulp removed,
has —
A buccal wall,
A lingual wall,
A gingival wall,
A distal (or mesial) wall.
And —
A sub-pulpal wall.
Also some portions of the mesial (or distal) wall of the
pulp chamber will remain next to the gingival wall as a mesial
(or distal) wall. In a bicuspid or molar with a single broad
pull? canal, there is no sub-pulpal wall.
Proximal cavities in the incisors and cuspids, on account
of the wedgelike or triangular form of these surfaces, have
but three surrounding walls
A labial wall,
A lingual wall,
A gingival wall.
And —
An axial wall.
When, in incisor or cuspid proximal cavities, the incisal
angle becomes involved so that its removal is required, a com-
plex cavity is formed by cutting an incisal step. There is in
this case no change in the naming of the walls of the proximal
portion of the cavity, as no one of the walls named has been
—
completely removed. Such a cavity will have
In the proximal portion